<template>
    <div class="cmt-container">
        <h3>发表评论</h3>
        <hr>
        <textarea placeholder="请输入要bb的内容(最多120字)" maxlength="120" v-model="msg"></textarea>
        <mt-button type="primary" size="large" @click="postComment"> 发表评论</mt-button>
        <div class="cmt-list">
            <div class="cmt-item" v-for="(item, i) in comments" :key="item.add_time">
                <div class="cmt-title">
                    第{{i+1}}楼&nbsp;&nbsp;用户: {{ item.user_name }}&nbsp;&nbsp;发表时间: {{item.add_time | dateFormat}}
                </div>
                <div class="cmt-body">
                    {{item.content === 'undefined' || item.content == false ? '此用户很懒, 嘛都没说' : item.content}}
                </div>
            </div>
        </div>
        <mt-button type="danger" size="large" plain @click="getMore"> 加载更多</mt-button>
    </div>
</template>
<script>
    import {Toast} from 'mint-ui'
    export default {
        data() {
            return {
                pageIndex: 1, //默认显示第一页数据
                comments: [],
                msg: '', // 评论输入的内容
            }
        },
        created(){
            this.getComments()
        },
        methods: {
            getComments() {     // 获取评论
                this.$http.get('api/getcomments/' + this.id + '?pageindex=' + this.pageIndex)
                    .then(result => {
                        if (result.body.status === 0 ) {
                            this.comments = this.comments.concat(result.body.message) ;
                        } else {
                            Toast('获取评论失败!')
                        }
                })
            },
            getMore() {     // 加载更多
                this.pageIndex++;
                this.getComments()
            },
            postComment() {     // 发表评论
                if (this.msg.trim().length === 0) {
                    return Toast('评论内容不能为空!')
                }
                
                // 参数1: 请求的URL地址
                // 参数2: 提交给服务器的数据对象 {content:this.msg}
                // 参数3: 定义提交时候, 表单中数据的格式 {emulateJSON: true}
                this.$http.post('api/postcomment/' + this.$route.params.id, {
                    content: this.msg.trim()})
                .then(function(result){
                    var cmt = {
                        user_name: '匿名用户', 
                        add_time: Date.now(), 
                        content: this.msg.trim()
                    }
                    this.comments.unshift(cmt)
                    this.msg = ''
                })
            }
        },
        props: ["id"],
    }
</script>
<style lang="scss" scoped>
    .cmt-container {
        h3 {
            font-size: 18px;
        }
        textarea {
            font-size: 14px;
            height: 85px;
            margin: 0;
        }
        .cmt-list {
            margin: 10px 0;
            .cmt-item {
                font-size: 13px;
                .cmt-title{
                    background-color: #ccc;
                    line-height: 30px;
                }
                .cmt-body {
                    line-height: 35px;
                    text-indent: 2em;
                }
            }
        }
    }
</style>